diff --git a/components/dfs/filesystems/elmfat/dfs_elm.c b/components/dfs/filesystems/elmfat/dfs_elm.c
index 08218b1461aca30a76d846e5dc1ad6957e2e3f1f..c2ccac1a895e1c4803ebd5d5c6f7bb0490384a03 100644
--- a/components/dfs/filesystems/elmfat/dfs_elm.c
+++ b/components/dfs/filesystems/elmfat/dfs_elm.c
@@ -103,27 +103,7 @@ int dfs_elm_mount(struct dfs_filesystem *fs, unsigned long rwflag, const void *d
 	/* mount fatfs, always 0 logic driver */
 	result = f_mount(index, fat);
 	if (result == FR_OK)
-	{
-		extern FRESULT chk_mounted(const TCHAR **path, FATFS **rfs, BYTE chk_wp);
-		extern int leavefs(FATFS*	fs, int res);
-		char driver[16];
-		const char * path;
-		DIR dj;
-		path = (const char *)driver;
-		rt_snprintf(driver, sizeof(driver), "%d:/", fat->drv);
-#if !_FS_READONLY
-		result = chk_mounted(&path, &dj.fs, 1);
-#else
-		result = chk_mounted(&path, &dj.fs, 0);
-#endif
-		if (result != FR_OK)
-		{
-			rt_free(fat);
-			return -1;
-		}
-		leavefs(dj.fs, result);
 		fs->data = fat;
-	}
 	else
 	{
 		rt_free(fat);
diff --git a/components/dfs/filesystems/elmfat/ff.c b/components/dfs/filesystems/elmfat/ff.c
index c8c27f6c0a26736b479f8d68bf63f73ed5f67fcb..e967bc76d7ffcf24dae5d64723d81286af5478fc 100644
--- a/components/dfs/filesystems/elmfat/ff.c
+++ b/components/dfs/filesystems/elmfat/ff.c
@@ -2004,7 +2004,7 @@ BYTE check_fs (	/* 0:The FAT BR, 1:Valid BR but not an FAT, 2:Not a BR, 3:Disk e
 /* Check if the file system object is valid or not                       */
 /*-----------------------------------------------------------------------*/
 
-
+static
 FRESULT chk_mounted (	/* FR_OK(0): successful, !=0: any error occurred */
 	const TCHAR **path,	/* Pointer to pointer to the path name (drive number) */
 	FATFS **rfs,		/* Pointer to pointer to the found file system object */
@@ -4019,8 +4019,3 @@ int elm_get_vol(FATFS *fat)
 	return -1;
 }
 #endif
-
-int leavefs(FATFS*	fs, int res)
-{
-	LEAVE_FF(fs, res);
-}